General Information:
Chemical Formula:
K2Na(Ca,Mn++)2(Ti,Fe)O[Si7O18(OH)]
Composition:
(Molecular Weight = 728.74 gm)
Potassium 10.73 % K
Calcium 9.62 % Ca
Titanium 5.58 % Ti
Manganese 1.88 % Mn
Iron 1.15 % Fe
Silicon 26.98 % Si
Hydrogen 0.14 % H
Oxygen 43.91 % O
Empirical Formula:
K2Ca1.75Mn2+0.25Ti0.85Fe2+0.15Si7O19(OH)
Environment:
K-feldspar metasomatites in contact with limestone.
IMA Status:
Approved IMA 1965
Locality:
Murun alkalic massif, near Olekminsk, Yakutia, Russia.
Name Origin:
Named fro the symbols of some of its component elements (Ti, Na, K).
Physical Properties:
Cleavage:
[010] Perfect, [110] Indistinct
Color:
pink, pale yellow, or light brown.
Density:
2.82
Diaphaniety:
Transparent to Translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers.
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
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